Let’s assume that zombies have the rights of citizens of both State A and the US and that they can be murdered (even though they are already dead). If an otherwise law abiding zombie is captured in State A and transported to State B against its will, where the perp uses zombie’s credit card to rent a hotel room and then kills zombie. Several federal and state laws are violated. The federal laws are invoked because of the interstate nature of the crime. The FBI will be involved. The various enforcement agencies may work it out amongst themselves on how the case will be prosecuted–whether under state or federal laws and whether in state or federal court.
Drug trafficking is a largely federal crime and eats up a lot the federal court resources due to the fact that the illegal substances are transported over state lines.
None of this has anything to do with abortions, unless a zombie can be considered equivalent to an unborn fetus?